Steam-boiler.



No. 879,961. BATENTED FEB. 25', 1908. GQHARTER.

STEAM BOILER.

APPLICATION IILBD JUNE 18, 1907.

2 SHEETS-SHEET 1.

INVENTOR PATENTED FEB. 25,1908.

0. HARTER.

STEAM BOILER.

APPLICATION FILED JUNE 18, 1907.

2 SHEETS-SHEET 2.

WITN ESSES CHARLES HARTER, OF TUCSON, ARIZONA TERRITORY.

STEAM-BOILER.

Specification of Letters Patent.

Patented Feb. 25, 1.908.

Application filed June 18 1907- Serial No. 379.569.

T all whom it may concern:

Be it known that 1, CHARLES HARTER, a citizen of the United States, residing at Tucson, in the county of Pima and Territory of Arizona, have invented certain new and useful Improvements in Steam-Boilers, of which the following is a specification.

My invention relates to steam boilers of the upright or vertical type, and its objects are; to provide a boiler of simple and com pact construction embodying an extremely large area of heating surface arranged to be acted upon directly by the heated gases during their entire passage from the furnace to the stack to provide means which will permit the tubes to be readily removed and replaced when desired; to provide a boiler which will permit of the use of a furnace in which the usual fire-arch may be dispensed with without affecting the efficiency of the furnace, and to. provide generally an improved form of upright boiler of economical construction and great efliciency. These objects and others which will hereinafter appear I attain by means of the construction illustrated in preferred form in the accompanying drawings, wherein Figure 1 is a vertical longitudinal section through a steam boiler and furnace embodying my improvements;

Figure 2 is a top lan view of the boiler, with the furnace bro en away;

Figure 3 is avertical cross-section of a portion of the boiler and its setting, taken on the line III-III of Figure 1, with the tubes broken away in order to show more clearly the-baffle partitions arranged on each side of the boiler, and

Figure 4 is a horizontal section taken on the line IVIV of Figure 1.

By reference to the accompanying drawings it will be seen that in carrying out my invention the main or body portion of the boiler consists of a central cylindrical shell 5, the lower end of which is inclosed in a cylindrical drum 6 of a larger diameter, and to the bottom of which it is secured in any suit- I able manner. An upper drum 7 corresponding in diameter with the drum 6 surrounds and is secured to the shell 5 near its upper end, which is closed, and the shell 5 is provided within the drums 6 and 7 with a series of openings 8 whereby the drums are in di rect communication with each other. The two drums are also directly connected on one side of the shell by a series of vertical water tubes 9, and on the other side by a series of curved water tubes 10 extending horizontally over the grate-bars 11 and terminating at their outer ends in a transversely disposed horizontal drum 12 to which they are secured in the usual manner and which rests in the front wall of the furnace in such a manner that a large portion of its surface adjacent the tubes will be exposed to the action of the furnace, thereby providing an increased heating surface at this point. The tubes 10 are approximately equally dividedone-half leading from the drum 12 to the lower drum 6, and the balance to the upper drum 7.

The shell 5 projects through and above the upper drum 7, and is provided adjacent its upper end with a steam outlet 14. The shell 5 is further provided with a series of internal vertical fire tubes 15 extending throughout its entire length, and affording a passage for the escape of the heated gases from below the boiler direct to the stack 16 in a manner to be presently described. The upper drum 7 is carried upon a structural support 28, and the lower drum 6 rests upon a foundation 17 provided below the fire tubes 15, with a chamber 18 communicating by means of a flue 19 with the space 20 between the boiler and setting 21. The setting 21 entirely surrounds the boiler except at the front side where its walls are extended straight out to form the usual furnace 22 which may be of any preferred construction. The horizontal portion of the tubes 10 and the drum 12 are located Within the furnace, above the grate bars, as has been heretofore described. As will be seen by reference to Figures 3 and 1, baflie walls 23 are located upon each side of the shell 5 at about its center line, and extend entirely across the space 20 and to within a short distance of the upper drum 7. By reason of such baffle walls, the heated gases will be compelled to pass from the furnace first upward and over the top of said baflie walls, thence downward upon the other side by way of the flue 19 and chamber 18 to the fire tubes 15 through which they will pass upward to the stack 16, as indicated by the arrows in Figure 1.

A sufficient space is left between the drum 7 and the surrounding wall of the setting 21 to permit of the removal of the tubes therethrough when desired, and such space is closed by means of the annular hinged doors 24, when not in use, as shown more clearly in Figures1and2. Theboilersetting is also proarranged about said tubular shell and convided with the usual doors for gaining access to the boiler, which may be located at any convenient pointsuch for instance as that indicated in dotted lines in Figure 4. The boiler is also provided with the usual blowofi pipe 26, gage glass 27, and inlet pipe 25 which discharges into the drum 7 just above the water tubes 9, as indicated in Figure 1.

From the foregoing it will be noted that owing to the direction of the line of flow of the heated gases from the furnace to the stack as above described, they will be caused to pass over a maximum amount of surface, during which time the tubes 10 and the drum 12 will receive the initial heat from the furnace, thereby rapidly raising the temperature of the water therein and causing an upward current at this point, while by reason of the comparative lower temperature of the tubes 9 the current will be downward therein, and especially so when fresh water is admitted through the pi e 25. Other advantages of the device wil readily occur to those familiar with the art.

Having thus described my invention and illustrated its use, what I claim as new and desire to secure by Letters Patent is the following 1. A boiler comprising in combination a pair of drums in substantial vertical alinement, a tubular shell extending between and through the two drums and secured to both faces of each drum and provided with openings into the drums, a series of fire tubes extending through the tubular shell and constituting a flue, and a series of water tubes necting the two drums.

2. A boiler comprising in combination a pair of drums in substantially vertical alinement, a third drum lying between and to one side of said pair of drums, a tubular shell communicating with and connecting the said pair of drums, a set of fire tubes extending through the tubular shell and constituting a flue, a set of substantially vertical water tubes connecting said pair of drums, a second set of water tubes connecting the said third drum with the top drum and a third set of water tubes connecting said third drum with the bottom drum.

3. The combination with a boiler comprising a pair of drums in substantially vertical alinement, and a series of tubes connecting the adjacent surfaces of the same, of a vertical casing inclosing the boiler and spaced away from the upper drum to permit the removal of the tubes, and a movable means for closing the opening between said casing and drum.

4. The combination with a boiler comprising a pair of drums in substantially vertical alinement, and a series of tubes connecting theadjacent surfaces of the same, of a vertical casing inclosing the boiler and spaced away from the upper drum to permit the removal of the tubes and a series of hinged doors adapted to close the opening between said casing and drum.

CHARLES HARTER. Witnesses T. M. SMITH, A. M. FRANKLIN. 

